Is this cylinder toasted help

[Welderman85]

I got this in group of saws I bought. It's a husqvarna 450. The cylinder had a few lines in it and to me they don't look deep maybe just on the surface. The pistion looks great. I can't tell if its scoring or just funny lines

 

[farmguywithasaw]

Doesn’t look bad to me how’s the piston look

 

[Welderman85]

Doesn’t look bad to me how’s the piston look

Pistion.lopks good

 

[Welderman85]

Doesn’t look bad to me how’s the piston look

The pistion looks good

 

[billyboy]

Looks like sanding marks from an attempted clean up. There’s a couple side by side by side vertical marks that might catch a fingernail. You might get something in there to investigate those verticle marks.

 

[HumBurner]

I would defer to the experts and builders for a final call, but that looks like it's on the edge of salvageable. You might look into using muriatic acid on it, but I doubt those marks will "buff out" AND still offer reasonable compression.

If it has transfers, I'd thoroughly make sure there isn't fine debris trapped in them.

 

[farmguywithasaw]

If the piston looks good I would say that is normal wear. Post a pic of the piston. The camera a lot of times makes it look worse than it actually is

 

[James Sawyer]

Remove the air filter and make sure the choke is open. Look thru the carburetor and bring down the piston and look at the piston skirt. If it scored this is one of the places that I'd look first... it's the easiest. Next remove the muffler cover or muffler depends on the saw and look thru the exhaust port, rotate the piston up check it skirt. Drop the piston and look thru to intake side of the cylinder. These areas will tell you what kind of shape or wear the saw has.

 

[quattro.pilot]

i dont think its that bad.

 

[eugene89us]

@Welderman85 I just posted a thread on my almost new Stihl MS 261. It has awesome compression at 168 psi, starts and runs like a dream. Restarts on first pull when warm/hot, never an issue. Wanted to document what I would say "baseline" compression and cylinder pics and was surprised to find up and down marks on the cylinder walls. I am expecting a new borescope this Friday so I can take better pics, but as I look with my crappy one, I even see original horizontal factory markings that are visible atop the up and down marks, so I think it may be normal wear as the piston and rings were breaking in. Here is my thread from earlier this week with 1 year old Stihl that is on its fourth gallon of fuel and Red Armor mix since first 2 gallons. Will post more as time goes by. What compression do you have?

https://www.arboristsite.com/threads/ms-261-carb-version-2022-compression-and-cylinder-marks.374152/

 

[Welderman85]

I got it running today it seems to run pretty good for a saw the guy said would never run again

 

[Welderman85]

I also did a compression test. I think she's ok and may live for another day. Now to decide what to do with the saw. I only have 8 bucks into so

 

[HumBurner]

I also did a compression test. I think she's ok and may live for another day. Now to decide what to do with the saw. I only have 8 bucks into so

That's on the low but still doable side of things. Did you put new rings on it? 150 is a good target, especially on the smaller saws. 170-180 is GENERALLY about where a broken-in saw will rest.


Those darker vertical lines on the left were what gave me apprehension about the condition of your cylinder. Those lines looked grooved into the walls.

 

[farmguywithasaw]

Run a couple tanks through it with good oil, then retest